Product Description:

The KDA 2.1-100-3-L0S-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. In a machining cell, this unit sits between the main power supply and the motorized spindle, converting the intermediate DC bus voltage into three-phase output that regulates torque and velocity with digital feedback. By coordinating acceleration, deceleration, and setpoint tracking, it keeps cutting tools at commanded speeds so material removal rates stay consistent and surface finish remains predictable in automated production lines.

The drive’s DC link operates from 300 VDC, giving the internal power modules enough headroom to generate the sinusoidal output required for high-speed spindles. A continuous output of 100 A supports demanding duty cycles without derating, while the heat sink blower is energized from a separate 115 V / 50/60 Hz source so fan performance is independent of load changes on the DC bus. Velocity references are received over the SERCOS interface, allowing deterministic communication with CNC or PLC motion controllers. Parameter adjustments and diagnostics can also be handled locally through the integrated serial interface (RS-232-C). The omission of a second encoder input keeps feedback wiring simpler when only one position transducer is required for spindle orientation or speed control.

Thermal stability is maintained by a mounted heat sink blower that draws air directly across the power stage. This supports the drive’s forced cooling mode and removes losses generated during continuous current delivery. Reliable operation is specified within an ambient range of 5 to 45 °C, so cabinet air management must keep the enclosure within those limits. Installation is approved up to 1000 m above sea level. The unit is listed as Series 2, indicating component updates over the original release without changing external dimensions or connector locations.